I always feel they are still too delicate as well.
I took 4 in yesterday, 6 and 7 days old 2 x 2sisters, difference in horn growth was amazing. She said the tiny ones (boer) were easy, but the dairy cross with stronger horn growth she had to finish off with a scalpel. Not a pretty sight but I have enough problems with the 2 horned boers, not aggressive but caught me a couple of times by accident.